Multipole circuit breaker with novel contact arm construction



Nov. 3, 1964 G. w. KIESEL ETAL 3,155,805

M'U'LTIPOLE CIRCUIT BREAKER WITH NOVEL CONTACT ARM CONSTRUCTION OriginalFiled April 15. 1960 3 Sheets-Sheet 1 INVENTORS GEORGE W K/EsEL, Ems/avM. WEGH 6M1 C 4 TTORNE' 1964 a. w. KIESEL ETAL 3,155,805

MULTIPOLE CIRCUIT BREAKER WITH NOVEL CONTACT ARM CONSTRUCTION OriginalFiled April 15, 1960 3 Sheets-Sheet 2 INVENTORS Gama: W. KIESEL,

EMERY M. was

WMJK A TTORNEY 1964 s. w. KIESEL ETAL 3,155,805

MULTIPOLE CIRCUIT BREAKER WITH NOVEL CONTACT ARM CONSTRUCTION OriginalFiled April 15. 1960 3 Sheets-Sheet 3 INVENTORS GEORGE W. K/Esn, MRY P7.Was/4 KMJ C 4 TT'ORNEY United States Patent 3,155,805 MULTIPOLE CIRCUITBREAKER WITH NOVEL CONTACT ARM CONSTRUCTION George W. Kiesel,Unionville, and Emery M. Wegh,

Terryville, Conn, assignors to General Electric Comparry, a corporationof New York Original application Apr. 15, 1960, Ser. No. 22,483. Dividedand this application Dec. 20, 1962, Ser. No.

4 Claims. (Cl. 200-166) Our invention relates to electric circuitbreakers and particularly to plug-in type multipole electric circuitbreakers adapted for use in panel assemblies, such, for example, as inthe panel assembly shown in Patent No. 2,738,446, W. I. Fleming, March13, 1956, assigned to the same assignee as the present invention.

This application is a division of copending application Serial Number22,483, filed April 15, 1960, and assigned to the same assignee as thepresent invention.

Electric circuit breakers of the type referred to herein arecharacterized by their extreme compactness. Such compactness is achievedin large measure by a particular arrangement of the basic componentportions of the electric circuit breaker. Such electric circuitbreakers, for example, comprise three primary component portions: (a) apair of separable contacts and associated arc-cooling and extinguishingmeans for each circuit or pole; (b) operating mechanism for operatingthe contacts both manually and automatically upon the occurrence ofoverload conditions, and (c) current-responsive means for detecting theexistence of such overload conditions and for initiating an actuation ofthe operating mechanism in response thereto. These components, inconventional circuit breakers, are ordinarily arranged within a moldedenclosing case in a row, with the current-responsive means at one end ofthe casing, the operating mechanism next, and the contacts and areextinguishing means at the opposite end. In the compact type of circuitbreaker referred to herein, however, the overall length of the circuitbreaker is significantly shortened by raisingv the opcrating mechanismand positioning the contacts and are extinguishing structure below theoperating mechanism,

so that these two components are in stacked relation.

As an incident of this arrangement, as the movable contact moves towardand away from the stationary contact, the contact arm supporting themovable contact It is another object of the invention to provide acircuit breaker of the type described in which the size and strength ofthe contact arm proper, as well as of the contact pressure spring areincreased without an increase in the size of the circuit breaker.

In accordance with the invention in one form, a circuit breaker isprovided including a. pivotally supported contact operating memberformed of sheet metal stock bent into a U or channel-shape, with abent-over lug at one end of the bight of the U. A contact arm ispivotally I carried by the ope-rating member and has a portion bent atright angles to the main position adjacent the bight of the U. A tensionspring is arranged between the bentover lug and the contact armextension, biasing the extension against the bight as a stop. The springis thereby positioned out of the path of hot arc gases emanating fromthe contacts.

In the drawings,

FIGURE 1 is a side elevation view, partially in section, of an electriccircuit breaker embodying the inven tion;

FIGURE 2 is a sectional plan view taken generally on the line 2-2 ofFIGURE 1;

FIGURE 3 is an exploded elevation view partially in section of thecircuit breaker of FIGURE 1;

FIGURE 4 is a partially exploded elevation sectional view of the circuitbreaker of FIGURE 1 showing the mechanism and current-responsive meansin mounted condition;

FIGURE 5 is a sectional plan view of the circuit breaker taken generallyon the line 5-5 of FIGURE 4;

FIGURE 6 is a fragmentary elevation view of the circuit breaker ofFIGURE 1 showing the mechanism in the olf position;

FIGURE 7 is a fragmentary elevation view of the circuit breaker ofFIGURE 1, showing the parts in the tripped position;

FIGURE 8 is an elevation view of an assembly of plugin type circuitbreakers according to the prior art, and

FIGURE 9 is an elevation view similar to FIGURE 8, showing an assemblyutilizing an electric circuit breaker of the present invention.

(1) Insulating Casing Construction Referring first to FIGURES l-S, theinvention is shown as embodied in a two-pole electric circuit breakercomprising an insulating casing of molded material including a centralbody portion 10 (see FIGURES 3 and 5), a top cover portion 11 and abottom cover portion 12. As indicated particularly in FIGURES 2 and 5,the central portion 10 includes a longitudinal extending integralvertical barrier portion 13 and a shorter similar barrier portion 14spaced apart therefrom to leave a space 15 for a cross or common tripbar to be described.

The longitudinal barriers 13 and 14 serve to essentially divide theinner space of the insulating easing into two elongated generallyrectangular chambers 16 and 17. Each of the chambers 16 and'17 containsa pair of con t acts comprising a stationary contact 18 and a movablecontact 19 (only one pair of contacts shown). In addition, each of thechambers 16 and 17 contains a trip device current-responsive meansindicated generally at 20 and to be described more fully hereinafter. Inaddition, the chamber 17 contains an operating mechanism serving tooperate the movable contacts of both chambers manually and automaticallyin a manner to be described.

The central insulating casing portion 10 further includes an integraltransversely extending horizontal bar'- rier 22 (see FIGURES 4 and 5) ineach of the chambers 16 and 17 and extending slightly more than one halfthe lengthwise distance of such chamber. Each of the bar riers 22 has aportion thereof notched or cut away as at 23 to permit movement of thecontact arm in a manner to be described.

The central casing portion 10 further includes trans versely extendingvertical barrier portions 24, 25, 26 which are in alignment and spacedapart to provide passages 27 and 28 for flexible conductors leading tothe movable switch members (to be described). i

It will therefore be observed that in effect, the generally rectangularspace within the-central insulating portion 10 is subdivided into twoelongated chambers 16 and 17 by the longitudinal barriers 13 and 14, andthat each of such chambers 16 and 17 is further subdivided. Thehorizontally extending transverse barriers 22 divide the forward portionof each of the chambers 16 and 17 into two substantially equal upper andlower portions.

- Patented Nov. 3, 1964 The transversely extending vertical barriers 24,25, 26 serve to subdivide the lower portion of each of the chambers 16and 17 into a forward and a rearward compartment. Thus in effect, eachof the chambers 16 and 17 is divided into three portions: an upper andlower forward portion and a rearward portion. In addition, horizontallyextending transverse barriers 29, are provided, for a purpose to bedescribed. All of the components of the circuit breaker according to theinvention are supported on and substantially contained within thecentral insulating member 10. The cover portions 11 and 12 serve toenclose and shield such parts.

(2) Terminals and Current Path The details of the construction of theparts will be set forth in connection with the pole chamber 17.Referring to FIGURES 1 and 2, a load terminal or connector 32 issupported on the barrier 39, and is retained thereon by the down-turnedlip of terminal strap 33. The terminal strap 33 extends through theconnector 32 and through an aperture 34 in the end wall 10a of thecasing portion 10, extends upwardly along the inner surface of the endwall, and is rigidly afiixed to the end wall by means of the screw 35.

It will be observed that the connector 32 when in position blocks accessto the screw 35. For this reason, the assembly of these parts isaccomplished as follows: The terminal strap 33 is assembled by inertingit through the open top of the casing portion 10 and projecting the endthereof through the aperture 34. The terminal strap 33 as initiallyassembled is bent so that the projecting end thereof extends in theposition shown in dotted lines in FIGURE 1. The screw 35 is theninserted and tightened. The connector 32 is thereafter slid onto the endof the strap 33 to the position shown. Following this, the end of theterminal strap 33 is bent down to its solid line position, trapping theterminal member 32 in place. This may be done by turning the clampingscrew 36 down to its lowest position, or by other suitable means.

A reverse-bent elongated bimetallic strip 37 is rigidly attached to theterminal strap 33 by suitable means such as by welding. The bimetallicstrip 37 has its free end portion 38 bent at right angles to its majorintermediate portion. A flexible electrical connector 39 is connected tothe end 38 of the bimetallic strip by suitable means such as by weldingor brazing and has its other end similarly connected to the switch arm40 carrying the movable contact 19. The movable contact 19 is adapted tocontact the stationary contact 18, which is carried by the bent-over lugportion 41 of the generally U-shaped contact jaw assembly 42. In orderto increase contact pressure of the socket 42, a resilient spring clipmember 43 is placed over the outside of the socket member 42. Thecentral casing portion 10 and the bottom cover portion 12 are providedwith contiguous openings 21 forming corner slots in the casing to permitthe insertion of contact blades in a manner to be described. The currentpath through this pole of the circuit breaker may therefore be traced asfollows: from line terminal strap 33 to bimetallic strip 37, to flexibleconductor 39, to switch arm 40, to movable contact 19, to stationarycontact 18, to line socket 42.

(3) Operating Mechanism and Contact Arms In order to move the switch armand movable contact 19 between open and closed circuit positions, anoperating mechanism is provided, comprising a pair of opposed sideframes 45 spaced apart by spacer pins 46 and 47. The side frames 45 areeach provided with downwardly extending mounting lugs 48 which projectthrough openings in the horizontal barrier portions 22. The lugs 48 areriveted or headed over against retaining plates 49 to securely mount theside frames 45 on the barrier 22. A generally U-shaped contact operatingmember 50 is pivotally supported on the spacer pin 47 and carries acontact cross-arm of insulating material 51. The switch arm 46 ispivotally supported on the pivot pin 52 carried by the operating member59 and has a projecting end portion 53 connected by tension spring 54 toa projecting lug 55 of the operator 50. The spring 54 serves toresiliently urge the contact arm 40 for rotational movement in acounterclockwise direction about its pivot 52 and, in the closedposition as shown in FIGURE 1, it urges the movable contact 19 intoengagement with the stationary contact 18.

It will be observed that the spring 54 is removed from the path of hotarc gases which may be generated by the separating contacts 18 and 19.Also, because of the space available at the location of the spring 54, alarger and stronger spring may be used than if the contact arm 40 itselfwere to be made resilient.

(4) Latching and Tripping Mechanism It will also be observed that theinsulating barrier 10B extends between the spring 54 and the contacts 13and 19, shielding the spring 54 from direct contact by the are gases.

For the purpose of operating the operating member 50 about its pivotpoint 47 between open and closed circuit positions, a pair of togglelinks 56 and 57 are provided. The link 56 is pivotally connected to thepivot pin 52, while the link 57 is pivotally connected at 58 to anormally stationary releasable member 59 pivotally supported between theplates 45 on spacer pin 60. The toggle links 56 and 57 areinterconnected by a pin 61.

When the toggle links 56, 57 are in the extended position as shown inFIGURE 1, the contact operating member 50 is held in the closed positionas shown. When the toggle links are moved to collapsed position, asshown for example in FIGURE 6, the contact operating member 56 is movedto the left or off position.

For the purpose of operating the toggle links, a manually operablemember is provided including an insulating handle member 62 and agenerally U-shaped metallic hanle support member 63 which straddles theframe members 45 and is pivotally supported upon lugs 63 struck out fromthe sides of the frames 45. A pair of elongated tension springs 64 aresupported between a pin 65 carried by the handle support member 63 andthe knee pin 61 of the toggle links.

As the manually operable member 62 is moved from on to o position andvice versa, the upper end of the spring 64 is moved to one side or theother of the line of centers of the toggle knee and the relativelystationary pivot 58, thereby collapsing and straightening the togglelinks.

For the purpose of releasably restraining the releasable member 59, alatch assembly is provided comprising a latch member 66 pivotallysupported between the side frames 45 by projections 67. The latch 66 hasan aperture 68 therein which is adapted to receive a latch projection 69carried by the releasable member 59. The latch member 66 carries atransversely extending insulating trip bar 70 which extends into both ofthe chambers 16 and 17. The latch assembly, including the latch member66 and the trip bar 70 is biased in a clockwise direction by tensionspring 71 which is connected to the frame spacer pin 46.

When the trip bar 70 is moved to the right as shown in FIGURE 1, so asto rotate the latch member 66 in counterclockwise direction about itspivot point 67, the latch member 66 is withdrawn from the latchprojection 69 of the releasable member 59. Upon release of theprojection 69, the tension spring 64 acting through the toggle links 56and 57, moves the releasable member to the fully tripped position asshown in FIGURE 7, causing automatic opening of the contacts andmovement of the manually operable member to a mid or trip indicatingposition. The releasable member 59 may be re-engaged with the latchmember 66 by moving the handle member 62 to the fully counterclockwiseposition coinciding with the off position as shown in FIGURE 6.

For the purpose of moving the trip bar to cause release of thereleasable member in the manner described, upon the occurrence ofpredetermined conditions in the circuit, current-responsive means isprovided. The current-responsive means includes the bimetallic strip 37previously described. In addition, magnetic tripping means is providedincluding a magnetic field piece 73 which is rigidly attached to thebimetallic strip 37 by suitable means such as by welding. A magneticarmature member 74 is provided which is pivotally held in notches 75 inthe side walls of the casing. The armature 74 comprises a generally flatplate of magnetic material. The armature 74 is loosely connected to thebimetatllic strip 37 by means of a generally J-shaped wire clip 76carried by the armature 74 and extending around in front of the magneticfield piece 73. The wire clip 76 is preferably constructed ofnon-magnetic material. The armature 74 is biased away from thebimetallic strip 37 by means of a compression spring 78 extendingbetween the bent-over portion 38 of the bimetallic strip and a lugportion 79 of the armature 74. The armature 74 is further provided withan elongated calibrating screw 80 which is threadedly engaged thereinand is adapted to contact the insulating tripbar 70 in a manner to bedescribed. The insulating casing comprising the center portion and thebottom cover 12 are each formed to provide an aperture affording accessto the calibrating screw 80. After assembly of the circuit breaker andcalibration thereof, the aperture referred to is closed by suitablemeans, such as by an insulating closure 81. Passage of excess currentthrough the bimetallic strip 37 causes the strip to deflect to the rightas viewed in FIGURE 1. Such deflection causes the armature member 74 tofollow because of the connection by the wire clip 76. This in turn movesthe calibrating screw 80, which engages the trip bar 70, rotating thetrip bar to cause tripping. Upon the occurrence of an extremely highoverload condition, a magnetic attraction is set up between the magneticfield piece 73 and the armature 74, moving the armature 74 to the rightas viewed toward the bimetallic strip 37. This causes the calibratingscrew 80 to engage the trip bar 70 in a similar manner to causetripping.

While the construction has been described in detail for the partssupported in the pole 17, it will be understood that correspondingparts, with the exception of the operating mechanism, are supported inthe pole space 16. Thus the contact cross-arm 51 is extended into thepole space 16 and a second contact operator 50 is supported thereon,being clamped thereto by means of the retaining plate 83. The plate 83has a ing 83' struck out and projecting into a recess in the cross-arm51 to position the assembly laterally on the cross-arm. A switch arm andmovable contact (not shown) are carried by the contact operator 50 in amanner similar to arm 40 and contact 19.

For the purpose of aiding in the extinction of electric arcs drawn bythe movable contact, an arc extinguishing assembly is providedcomprising a generally U-shaped fiber supporting wall 84, see FIGURE 4,having a series of generally U-shaped plates of magnetic material 85supported therein. An insulating barrier plate 86 is slid into notches87 in the pole space 16 and serves to limit movement of the switch arm40 in the contact opening direction in this pole space.

It will be observed by reference to FIGURE '3 that virtually all of theparts of the circuit breaker are supported on the central insulatingsection 10. Thus the line terminal strap 33 and its associated partscomprising the terminal connector 32 and the bimetallic strip 37 aremounted on the end wall 10A. The armature member 74 is supported innotches in the insulating casing being held spaces is supported upon thebarriers 22 of the section 10. The are extinguishing assemblies and linecontact assemblies comprising the arc extinguishing members 84 and 05and the plug-in line contact 42 are supported on the base portion 12 andcontained within the chamber formed by the lower portion of the centralsection 10. The manner of assembly of the parts is clearly shown in theexploded FIGURE 3 of the drawings. Thus as indicated, the main operatingmechanism and the line terminal strap and bimetallic strip are assembledfrom the top of the section 10, while the armature member 74 and the arcextinguishing assembly and line contact assembly are assembled from thebottom. Once these parts are assembled, the top and bottom covers arethen put in place and the assembly held together by suitable rivets orbolts extending through the openings 86. This casing constructionprovides very effective mechanical reinforcement for the side walls ofthe center section 10, greatly contributing to its strength. Inaddition, the construction effectively isolates the arcing chamber fromthe remaining portion of the pole chambers.

In addition to the above advantages, this type of assem bly has theimportant advantage that it is possible to mount all of the parts intheir final positions, to calibrate, adjust, and examine the entiremechanism after it is in its finally mounted position, before adding thetop and bottom covers. This is an important advantage in the manufactureof such devices.

(5) Plug-In Terminal Construction In accordance with another aspect ofthe invention, an electric circuit breaker is provided of the plug-intype which is suitable for use in protecting higher rated circuits thancustomarily used in such plug-in panel assemblies. In accordance withthis aspect of the invention, the circuit breaker is provided with anenlarged line contact socket which is adapted to cover the entirecontact blade of such a panel assembly. This prevents the mounting of asecond circuit breaker on such contact blade and therefore avoidsoverloading of such a contact blade. In FIGURE 8 there is shown anendwise elevation View of a panel assembly utilizing circuit breakersaccording to the prior art, such for example as shown in our priorabovementioned patent. Such a panel assembly comprises a supporting baseor pan having an insulating base 101 supported therein by suitablemeans, not shown. The insulating base 101 serves to support a pluralityof bus bars 102 for connection to a source of electric power. The busbars 102 are also provided with a plurality of branch connecting straps,not shown, terminating in upstanding contact blades 103 alignedcentrally of the support. The supporting pan 100 further includesoutwardly directed flanges 104 provided with inturned retaining lugs ortangs 105. The circuit breakers 106 are mounted on this supporting baseby hooking one end portion thereof under the retaining lugs 105,pivoting the circuit breaker about the lugs 105 and plugging them intocontact with the central contact blade 103. The supporting assembly andthe circuit breakers are dimensioned so that each contact blade 103 isadapted to receive two circuit breakers 106 in endwise aligned relation.It will be apparent that the contact blade 103 and its associated branchstrap must carry the total current required by the two circuit breakers106. Since such panel assemblies ordinarily are designed to utilizecircuit breakers rated from 15-70 amperes, such branch connecting strapsmay not have suflicient capacity to feed two circuit breakers each ratedhigher than 70 amperes. In accordance with the invention, the circuitbreaker is provided with a casing of increased length and a contactsocket is provided which utilizes the entire blade 103, making itimpossible to mount another circuit breaker on the same contact blade.In addition to assuring that such contact blade will not be overloaded,this construction provides increased contact area for the 100 amperecircuit breaker.

.While the invention has been described as embodied in a two-polecircuit breaker, it will be appreciated that the inventionis equallyapplicable to a three-pole circuit breaker, in which case an insulatingcasing is provided having three pole chambers and having a contactcrossarm 51 and trip bar 70 extended across all three such polechambers.

While the invention has been shown in one specific embodiment, it willbe readily apparent that many modifications thereof may be made withoutdeparting from the spirit of the invention. It is therefore intended bythe appended claims to cover all such modifications as fall within thetrue spirit and scope of the invention.

What we claim as new and desire to secure by Letters Patent of theUnited States is:

1. An electric circuit breaker comprising:

(a) a pivotally supported contact operator having two opposed sideportions and an intermediate bight portion,

(b) means supporting said contact operator for pivotal movement about apivotal axis through said side portions,

(c) a relatively movable contact arm pivotally supported on a pivot pinextending through said side portions,

(d) said contact arm having a first portion extending from said pivotpin and carrying a movable contact thereon and a second portionextending from said pivot pin at an angle tosaid first portion, and

(e) a tension spring between said second portion of said contact arm andsaid bight portion of said contact operator biasing said switch arm forrotation about its pivotal support and into engagement with said bightportion of said contact operation as a stop.

2. An electric circuit breaker comprising:

(a) a contact operator of sheet metal comprising a bight portion andupwardly bent opposed side portions,

(b) said bight portion having an outwardly bent lug portion at one endthereof extending in a direction opposite from said side portions,

(c) said contact operator being pivotally supported on a pivot pinextending transversely between said opposed side portions,

(d) a movable contact member pivotally supported on a pivot pinextending transversely between said side portions and spaced away fromsaid contact operator pivot pin,

(e) said movable contact member comprising an elongated contact armhaving a first portion projecting from said pivot pin and carrying amovable contact at the end thereof and a second portion extending fromsaid pivot pin at an angle to said first portion, and

(f) a tension spring extending between said second portion of saidcontact arm and said lug bent from said contact operator and biasingsaid contact arm for rotation about its pivotal support.

3. An electric circuit breaker compirsing:

(a) a contact operator'of sheet metal having a bight portion andupwardly bent opposed side portions extending substantially at rightangles to the plane of said bight portion,

(b) said bight portion having an integral lug at one end thereofextending substantially at right angles to the plane of said bightportion in a direction opposite from said side portions,

(0) means pivotally supporting said contact operator for movement abouta first axis extending transversely of said side portions at one endthereof.

(d) a movable contact arm pivotally supported for movement about asecond axis extending transversely of said side portions at the otherend thereof,

(a) said. movable contact arm having a first portion extending in afirst direction from said second axis and carrying a movable contactadjacent the end thereof,

(1) said movable arm having a second portion extending from said secondaxis in a direction substantially at right angles to that of said firstportion,

(g) a tension spring extending between said second portion of saidcontact arm and said integral lug of said bight portion of said contactoperator, said tension spring biasing said contact arm for rotationabout said second axis,

(11) said bight portion of said contact operator serving as a stop tolimit rotational movement of said contact arm when said contact arm isin contact-disengaged condition.

4. An electric circuit breaker comprising:

(a) an insulating casing,

(b) at least one relatively stationary contact supported in saidinsulating casing,

(c) at least one relatively movable contact supported for movement intoand out of engagement with said relatively stationary contact,

(d) an elongated contact arm carrying said relatively movable contactadjacent one end thereof,

(e) a contact operating member of flat sheet metal having a bightportion and a pair of upstanding parallel side portions extendingsubstantially at right angles to the plane of said bight portion,

(1) a spring anchor lug projecting from said bight portion at one endthereof,

(g) means pivotally supporting said contact arm at an intermediate pointthereof on said contact operating member,

(h) spring means interconnecting the other end of said contact arm andsaid lug portion of said contact operating member,

(1') means pivotally supporting said contact operating member in saidcasing,

(j) means for operating said contact operating member about said pivotalsupport to operate said movable contact into and out of engagement withsaid stationary contact, and

(k) an insulating barrier carried by said casing intermediate saidspring means and said relatively stationary contact, whereby to shieldsaid spring means from impingement by are gases.

References Cited in the file of this patent UNITED STATES PATENTS2,788,421 Jones Apr. 9, 1957

1. AN ELECTRIC CIRCUIT BREAKER COMPRISING: (A) A PIVOTALLY SUPPORTEDCONTACT OPERATOR HAVING TWO OPPOSED SIDE PORTIONS AND AN INTERMEDIATEBIGHT PORTION, (B) MEANS SUPPORTING SAID CONTACT OPERATOR FOR PIVOTALMOVEMENT ABOUT A PIVOTAL AXIS THROUGH SAID SIDE PORTIONS, (C) ARELATIVELY MOVABLE CONTACT ARM PIVOTALLY SUPPORTED ON A PIVOT PINEXTENDING THROUGH SAID SIDE PORTIONS, (D) SAID CONTACT ARM HAVING AFIRST PORTION EXTENDING FROM SAID PIVOT PIN AND CARRYING A MOVABLECONTACT THEREON AND A SECOND PORTION EXTENDING FROM SAID PIVOT PIN AT ANANGLE TO SAID FIRST PORTION, AND (E) A TENSION SPRING BETWEEN SAIDSECOND PORTION OF SAID CONTACT ARM AND SAID BIGHT PORTION OF SAIDCONTACT OPERATOR BIASING SAID SWITCH ARM FOR ROTATION ABOUT ITS PIVOTALSUPPORT AND INTO ENGAGEMENT WITH SAID BIGHT PORTION OF SAID CONTACTOPERATION AS A STOP.